using System;

namespace Application
{
	public class Teste
	{
		static void troca (ref string s, ref string t)
		{
			string tmp = s; s = t; t = tmp;
		}
	static void Main ()
		{
			string a = "Passo", b = "Coelho";
			Console.WriteLine(a+b);
			troca(ref a, ref b);
			Console.WriteLine(a+b);
		}
	}
}

